Determining the US State from Latitude and Longitude

[tpmcd]

As a part of a larger project I'm looking for methods or examples of how to determine which of the 50 US States a vehicle is located in given its latitude and longitude. More detailed information like city, county, etc. isn't required but I can always toss out extra stuff.

Ultimately the "solution" will become a procedure or function that is incorporated into a stand alone (non-web based) program but there is a database available if lookup tables or other data sets are needed.

Thanks for any pointers or suggestions.

Tim

[debasisdas]

You need to store all the Latitude and Longitude related data in the database table . Then you need to retrive the info implement the logic . I think u need to check for the intersection of Latitude and Longitude for the same.

[tpmcd]

You need to store all the Latitude and Longitude related data in the database table . Then you need to retrive the info implement the logic . I think u need to check for the intersection of Latitude and Longitude for the same.

Agreed. My search so far looks like the state boundaries are typically available as "shape files" used by various creators of Geographic Information Systems. The solution it seems will be to store that data in the database and create a query that can be used to determine which shape (state) encloses the specific coordinates being checked.

Tim

[JosAH]

As a part of a larger project I'm looking for methods or examples of how to determine which of the 50 US States a vehicle is located in given its latitude and longitude. More detailed information like city, county, etc. isn't required but I can always toss out extra stuff.

Well you do need the lat/long points that make up the border polygon of a state.
Determining in which polygon (state) a certain pont lies, isn't that much of a problem.

kind regards,

Jos

[Shashi Sadasivan]

Google maps
yahoo maps
Microsoft live maps
They all have API,s...free to use (including microsofts...all are implemented in javascripts but you can get the equivalent work in other languages done from some open source developers)

Cheers

[nick b]

does anyone know of a site where i can download the lat/long of each state border in a data set?

[RedSon]

You can do a google search for GIS Data and see if any of those are what you are looking for.